Car retarder structure



April 16, 1935. H. L. BONE 1,998,116

CAR RETARDER STRUCTURE v Filed July 11,1935

v I 'INVENTOR Harbpm" L- B0129 HIS ATTORNEY Patented Apr. 16, 1935 1,998,116

UNITED STATES PATENT OFFICE CAR RETARDER STRUCTURE Herbert L. Bone, Pittsburgh, Pa., assignor to The Union Switch & Signal Company, Swlssvale, Pa., a corporation of Pennsylvania 7 Application July 11, 1933, Serial No. 679,875

1 Claim. (Cl. 85- 9) My invention relates to car retarder strucis a condition which is not desirable from the tures, and particularly to that part of such strucpoint of view of strength and clearance. It is tures which involves a brake beam, a brake shoe, desirable, however, that the bolt should be and means for attaching the shoe to the beam. easily removable so that it can be taken out if 5 One feature of my invention is the provision it should break or if removal and use again 5 of a structure of this kind permitting the use after the brake shoe has been worn to its conof a bolt which has maximum strength for a demning limit is desirable. In a structure emgiven size, and which is capable of being easily bodying my invention only a small amount of replaced in the event of breakage. the bead S will overhang the upper part of the I will describe one form of car retarder strucbolthead A and since the bolt is preferably 10 ture embodying my invention, and will then point made of high grade hard steel, it will act as at out the novel features thereof in claim. punch when driven out, thereby cutting the bead In the accompanying drawing, Fig. 1 is a and permitting easy removal of the bolt. transverse sectional view through a car retarder By making both the bolt and the brake shoe structure embodying my invention. Fig. 2 is of hard material, suflicient bearing surface for 15 a front view of the structure shown in Fig. l. the head of the bolt against the brake shoe may Similar reference characters refer to similar be provided and yet the center line of the bolt parts in each of the views. may be kept as close as possible to the horizontal Referring to the drawing, the reference charleg of the shoe.

acter B designates the usual brake beam, to The use of a bolt instead of the customary 20 which a shoe S is attached by means of a bolt .stud for attaching the brake shoe to the brake A. The shoe is in the form of an inverted L, beam eliminates the necessity for threads in the with the vertical leg in contact with the brake brake shoe, and the elimination of these threads beam B, and with the horizontal leg extending at the points of greatest stress, that is, at the away from the beam and terminating in the joint between the brake shoe and the brake 25 usual wheel-engaging surface 5*. beam, provides for maximmn strength for a bolt The beam B is provided with a hole B and of given size. the shoe S is provided with a hole B which Although I have herein shown and described holes are in registry to receive the shank of the only one form of car retarder structure embodybolt A. The hole B is eccentrically countering my invention, it is understood that various 30 sunk at S the bulge of the countersink being changes and modifications may be made therein on the side of the hole opposite to the horizontal within the scope of the appended claims without leg of the shoe S. The belt A is provided with departing'from the spirit and scope of my invenan eccentric head A which fits the eccentric tion.

countersink in the shoe, thereby preventing the Having thus described my invention, what I 35 bolt from turning with respect to the shoe and claim is: beam. The other end of the bolt A is threaded In combination, two separable members and a to receive a nut 4, the usual lock washer 5 bebolt for clamping said members together, the ing interposed between this nut and the brake first of said members being L-shaped with one 40 beam B. leg in contact with the surface of the second 40 Preferably the inner face of the bolthead is member and the other leg extending away from cut away at A to avoid the eccentric load on the second member, said second member and the the bolt which would occur should the entire first leg of the first member having formed bolthead be in engagement with the base of the therein registering bolt holes located a short discountersink and which would tend to cause bend tance from the second leg of the first member, 45 ing stresses in the bolt when the nut 4 is tightand the hole in the first member being eccenened. trically countersunk with therbulge of the coun- As the wheel-engaging surface S of the shoe tersink on the side of the hole opposite to the S wears, this surface rolls over and forms a bead second leg, said bolt being provided with an eeat the top and bottom, which bead is indicated centric head which fits the eccentric countersink 50 by the dotted line S This bead makes it diffiin the first member and the inner face of said cult to remove the ordinary bolt from the brake bolt head being cut away at the bulge to avoid shoe unless the bolt holes are low enough to excessive eccentric loading of the bolt. permit the bolthead to clear the beam, and this HERBERT L. BONE. 

